An assailant on Thursday wounded two girls aged six and 11 in a knife attack close to their school in the east of France and was later arrested, officials said.

The 11-year-old was stabbed outside the school in the town of Souffelweyersheim just outside the main regional city of Strasbourg, while the six-year-old was attacked by the same man nearby.

Both received superficial wounds, police said, adding the attacker did not appear to have any known links to radicals and was not previously known to the security services.

Both girls are being treated in a paediatric hospital. Parents were later in the afternoon allowed to pick up their children, who had been confined to the school in the immediate aftermath of the attack.

The attacker, born in 1995, was arrested in the area where he attacked the second girl, the police said. He no longer had the knife in his hand and did not resist arrest, it added.

The attack came as Prime Minister Gabriel Attal announced a series of measures aimed at cracking down on violence committed by schoolchildren against their peers. There was no indication so far that the attacker had a link with the school.

"I'm really scared. We've been reassured that the children are safe inside, but we don't know when we'll be able to get them back," Sarah, a mother of an eight-year-old pupil, told AFP before the green light was given to collect the children.

"A friend called me. She saw the commotion in front of the school as she passed by. Her reflex was to call me so that I could pick up my son."